Its lot is to be soundly beaten (4)

I believe the answer is:

drum

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'to be soundly beaten' is the definition.
I can't judge whether this definition defines the answer.

'its lot' is the wordplay.
'its' becomes 'dru' (I can't justify this - if you can you should believe this answer much more).
'lot' becomes 'm'.
'dru'+'m'='DRUM'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for drum that I've seen before include "12th" , "Large barrel" , "nightclub" , "Hollow cylinder with flat ends" , "Spool; beaten instrument" .)

I've seen this clue in The Irish Independent.

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